CHAPTER 7 DEPOT OVERHAUL STANDARDS

TM 11-6425-647-45/NAVAIR 16-30APM123-2/TO

33A1-3-367-22

CHAPTER

DEPOT OVERHAUL STANDARDS

NOTE

See Chapter 7.1 For procedures Using AN/TPM-25A.

7-1. Applicability of Depot Overhaul

Radar Test Set AN/UPM-137A. Paragraph 7-3.1

and figure 7-1 describe the initial setup and adjust-

Standards

ments for the tests without the AN/UPM-98A and

The tests outlined in this chapter are designed to

paragraph 7-3.2 and figure 7-1.1 describe the ini-

measure the performance capability of a repaired

tial setup and adjustment for the tests using the

equipment. Equipment that is to be returned to

AN/UPM-137A. For all of the test procedures,

stock should meet the standards given in these

refer to figure 3-6 for test point location and figure

tests.

3-7 for adjustment control location.

7-2. Applicable References

7-3.1. Initial Test Procedures Using

AN/UPM-98A or AN/UPM-98B

a. Repair Standards. Applicable procedures of

the depots performing these tests and the general

a. Use the equipment in (1) through (6) below to

standards for repaired electronic equipment given

make the connections shown in figure 7-1. Connect

in TB SIG 355-1, TB SIG 355-2, and TB SIG 355-3

the AN/URM-64 to the CM-77/USM.

form a part of the requirements for testing this

(1) Oscilloscope AN/USM-281A.

equipment.

(2) Frequency Meter AN/USM-207.

b. Technical Publications. The technical publica-

(3) Comparator, Frequency CM-77A/USM.

tions applicable to the equipments to be tested are

(4) Modulator MD-796.

indicated below:

(5) Generator, Signal AN/URM-64A.

Equipment and subject

Publication

(6) Test Set, Radar AN/UPM-98.

Operator's and Organizational and

TM 11-6625-667-12

NOTE

Maintenance Manual Teat Set,

Either the AN/UPM-98A or the

Transponder AN/APM-123(V)1,

AN/UPM-98B may be used for all proce-

AN/APM-123(V)2, and

AN/APM-123(V)3

dures.

(NSN 6625-00-948-0071).

on t h e A N / U R M - 6 4 , A N /

b. Turn

General Support and Depot

TM 11-6625-667-45

USM-207, and CM-77A/USM. Allow l-hour warm-

Maintenance Manual: Teat Set,

up period

Transponder AN/APM-123(V)l,

c. Set the AN/USM-207 controls as indicated be-

AN/APM-123(V)2, and

AN/APM-123(V)3

low:

(NSN 6625-00-948-0071).

DIRECT/HETERODYNE switch: HETERODYNE

VOLTAGE switch: 10V

c. Modification Work Orderss. Perform all modifi-

FREQ TUNING-MC: 200

tation work orders applicable to this equipment be-

POWER: TRACK

fore making the tests specified. DA Pam 310-4 lists

FUNCTION: FREQ.

all available MWO's.

SENSITIVITY: PLUG IN

d. Set the AN/URM-64A FUNCTION control to

7-3. General Requirements

CW, ATTENUATOR control to -9 dBm, and SIG-

The majority of the depot overhaul standards tests

NAL FREQUENCY control to 1,090 mc.

shall be performed using the test setups shown in

e. Turn on all test equipment that was not turned

figures 7-1 and 7-1.1. Make initial connections arid

on previously.

adjustments described in paragraphs 7-3.1 or 7-3.2

f. Tune the CM-77A/USM FREQUENCY

and modify these as required for the individual

MEGACYCLES dial for zero beat indication. Ob-

tests. Two test procedures are provided for those

serve the indication on the AN/USM-207. Add 200

tests that use test equipment that is replaced by

to the number and multiply the result by five. The

Change 5 7-1